Why is my LAN not gigabit?
Torben Gundtofte-Bruun
The in-wall CAT5e LAN cabling in my newly built house (photos during construction) is weird: it works perfectly fine except it only allows 100Mbps and not gigabit. To clarify, the wired LAN "connection information" in both Windows and Ubuntu says that the connection speed is 100Mbps. The status lights on the switch itself confirm this.
I've tried a few things now and found that I do get gigabit if I use a plain 10-meter LAN cable instead of the in-wall cabling! It would seem that the in-wall cabling is wrong!
How can this be? How can the LAN work fine insofar as I do get a normally functioning Internet connection, but not a gigabit connection?
You can see the actual punched wiring in the photos linked above, correctly following to the T568B standard to the best of my knowledge. I have punched all 8 wires of all 20 LAN cables, and I have successfully tested that each of these 160 wires is electrically connected to the corresponding wall socket.
I'm thinking perhaps the electrician messed up the wall sockets?
I'd love if I could fix this problem simply by re-punching a pair of wires for each LAN cable in the patch panel. Is it possible that some wires are just switched around? If so, which ones?
(Note: I've completely re-written my original question to reflect my new findings.)
Torben Gundtofte-Bruun
Blackbeagle's answer was quite close, but not accurate after all. I've dug into something that I thought was probably unrelated, namely that the wires had an odd sequence, and that turned out to be the culprit! See photos below.
The essence is that the wall sockets (I took them apart) seem to be wired poorly but in the proper sequence, and the patch panel is wired according to the same standard... but somewhere, the labels must be mixed up because if I switch the wires around in the patch panel, it suddenly works!
Embarrassing admittance: In documenting this answer, I take a close-up photo of the patch panel's internal connectors and their labels. To my embarrassment, I notice that it's not labelled
1,2,3,4,5,6,7,8 but rather
1,2,4,5,3,6,7,8! Can you spot the difference?
I've rewired one port accordingly and now it works with gigabit speed! (This is why I didn't want to accept Blackeagle's answer.)
The wall socket is poorly patched but the sequence is okay:
Experimentally swapped the wires on one port:
That worked! Now I need to do the same on all the ports. That's when I discover...:
What?! The sequence is not as I thought it was. It's my own fault and I've been overlooking it all this time. I am embarrassed :-)
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